As of my last update, there is no widely recognized artist named Ennio Morelli that fits the standard parameters of an art historian's subject. It's possible that Ennio Morelli could be an emerging artist, a lesser-known figure in the art world, or perhaps even a fictional or mistakenly named individual. The world of art is vast and continuously evolving, with new artists coming to the fore all the time, and historical figures sometimes being rediscovered or reevaluated. Additionally, the name might be associated with fields adjacent to visual arts, such as music, literature, or performance art, which might not be covered extensively within traditional art historical texts. If Ennio Morelli has made significant contributions to the art world or any related field, further details might become available as his work gains recognition or as more research is conducted into his contributions and background.